The Collaborative International Dictionary of English. 2000.
heptad — [hep′tad΄] n. [Gr heptas (gen. heptados) < hepta, SEVEN] a series or group of seven … English World dictionary
heptad — noun Etymology: Greek heptad , heptas, from hepta Date: 1660 a group of seven … New Collegiate Dictionary
heptad — /hep tad/, n. 1. the number seven. 2. a group of seven. 3. Chem. an element, atom, or group having a valence of seven. [1650 60; < Gk heptad (s. of heptás). See HEPTA , AD1] * * * … Universalium
heptad — [ hɛptad] noun technical a group or set of seven. Origin C17: from Gk heptas, heptad , from hepta seven … English new terms dictionary
heptad — hep•tad [[t]ˈhɛp tæd[/t]] n. 1) math. the number seven 2) math. a group of seven • Etymology: 1650–60; < Gk heptad , s. of heptás. See hepta , ad I … From formal English to slang
heptad — /ˈhɛptæd/ (say heptad) noun 1. the number seven. 2. a group of seven. 3. Chemistry an element, atom, or group having a valency of seven. {Late Latin heptas, from Greek: the number seven} …
Heptad repeat — The heptad repeat is an example of a structural motif which consists of a repeating pattern of amino acids: a b c d e f g H P P H P P Pwhere H represents hydrophobic residues and P represents polar residues. The positions of the heptad repeat are … Wikipedia
heptad — noun a group of seven things … Wiktionary
heptad — A septivalent chemical element or radical. * * * hep·tad (hepґtəd) any element having a valency of seven … Medical dictionary
HEPTAD — a term in chemistry to denote an atom that is the equivalent of seven atoms of hydrogen, from hepta, seven … The Nuttall Encyclopaedia
